Questions tagged [thermal-insulation]
61 questions
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What colour of tarp will let in the least amount of heat?
Source: Low Tunnel Construction: How to Build a Mini Hoop House
I have a small greenhouse that I want to keep as cold as possible in the spring. I plan to cover the greenhouse with a polyethylene tarp to shield it's contents from the sun.
However,…
User1974
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Suggestions on how to keep electronics cool in high ambient temperature location?
What are the best materials and methods to keep the internal temperature of a device lower then the ambient temperature outside of the device? Based on the following information:
Starting temp of device is 20°C
Ambient temperature around the device…
Dave
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4
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How to connect butted or overlapping fiberglass insulation
We are working on a project requiring a temperature-controlled oven for melting lead, tin and other low-temperature metals. The inner cylinder is aluminum. The heat comes from Kanthal wire, for which we needed an electrical insulator capable of…
Dov
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4
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More efficient to use LED lighting than to open blinds for light and thereby lose heat when very cold outside?
Currently here it is 9 degrees Farenheit. My home is heated by electric resistance heating (not a heat pump, just plain heating coils). Am I correct in believing that it's more energy efficient to keep our wooden blinds and curtains closed and…
Paul
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Effective R-value of radiant barriers
I know that radiant barriers (i.e., reflective films applied over or under insulated spaces) don't technically have R-values (because they primarily reflect heat, instead of primarily slowing convection and conduction as does traditional…
feetwet
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Simulation of temperature in insulated box
I have a box outside that I want to insulate such that the temperature inside the box doesn't drop below 10°C given outside temperatures of (in the most extreme case - at night) -10°C. Inside the box I have a "heater" of 5 W. The box is in direct…
Daniel Jour
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Heat Loss in Typical House
I recently looked up the recommended insulation value for my area (7) and was surprised how much lower the wall insulation value was shown to be. As you can see it is almost a third of the recommended attic value. I am fairly certain that these…
Jonathon
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Why Heat Exchangers are preferred to work in Constant Pressure Process than Constant Volume Process?
Why Heat Exchangers are preferred to work in Constant Pressure Process than Constant Volume Process?
Mostly, all problems are solved in Constant Pressure Process
Pradeep Somasundaram
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What paint/spray on material should I use to insulate a metal pole?
I am not entirely sure if this is the correct forum to ask this question so please refer me on if there is a better arena.
I am creating a small weather station and I wish to measure soil temperature. I am aware that digging a hole and then burying…
PaulBarr
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2
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R value of a hole?
Suppose I have a room, 10x10x10m with insulated walls (R-value: 4) and a single double-pane window 1x1m (R-value: 0.35).
Now the total thermal power required to keep the room at a desired temperature is given by:
$$
P = \left( \frac{6\cdot 10\cdot…
divB
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2
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Trapping sun heat the most - greenhouse
Greenhouse have recently caught my attention lately, which yesterday I posted in Why greenhouse's inside temperature never been infinitely hot?
From what I understand recently, greenhouse gases traps the sun heat (infrared radiation) on earth, by…
gijoe
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Heat loss calculation and Energy Balance
The image shows the CAD model of the annealing zone in a galvanization simulator. The zone is electrically heated with a AC current of 5597A at 2.09V. This whole zone is surrounded by insulating material. The power input is 11.7kW. Electrical…
Selvaprakash Vijay
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2
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How does concrete perform in an Insulated Concrete Form (ICF) house?
From: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4033560/
I can see that concrete can really go bad after a few hundred freeze and unfreeze cycles:
If an ICF house has insulation from the inside of the house, then the concrete will be cold, if…
cirka547
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Insulator thermal resistance
I have a machine that has power output of 2750 watt, which is blasted to a insulator foam with thermal resistance of 2.1 m2 kelvin/watt where the insulator is 5 cm thick and it drives the heat into ventilation and out of the roof.
I want to make…
ethereal1m
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How thick do I need to make the insulation in my homemade furnace?
(This is probably a simple question, but I've been staring at it so long I'm not sure I know how to do it any more. I have an Excel spreadsheet with like 3 different ways to calculate this, and they all give different results, so I know I've screwed…
Reid Rankin
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